Re: AC_C_BIGENDIAN answers "universal" on powerpc-aix

[Eric Blake]

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According to Peter O'Gorman on 8/14/2008 11:02 PM:
> It seems likely that someone is already using that define in a progect.
> The macro is meant to be internal to autoconf, why not have it in
> autoconf namespace?

OK.

> 
>>> +#  define WORDS_BIGENDIAN 1
>> Not quite right, since this is for an autoheader template.  In the
>> AH_VERBATIM, it should look like the instance four lines later:
>>
>>> +#  undef WORDS_BIGENDIAN
>> and let config.status do the conversion to the desired state in both
>> locations.
> 
> No, it is correct as is. The compiler, for one invocation will go over
> the sources multiple times, once for each -arch setting.

Yes, I understand that part.  But my point was that autoheader templates
that look like:

#undef WORDS_BIGENDIAN

are transformed to:

#define WORDS_BIGENDIAN 1

by config.status when creating config.h, and that we just added
documentation in the manual stating that the use of:

#define anything

in the autoheader template gives undefined behavior when processed through
config.status.  Seeing as how the non-apple line follows the template
standard of using #undef for the AC_SUBST key, I'm arguing that the
apple-specific line should do so, likewise.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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